Comments inline. On 26-Jan-2014, at 8:35 am, Nux! <[email protected]> wrote:
> On 26.01.2014 00:39, John Mancuso wrote: >> So, I am planning on setting up a brand new cloud infrastructure >> using Cloudstack 4.2 on RHEL6. Cloudstack is hypervisor agnostic- I >> got that... However there are some differences and features that are >> available on XenServer that are not available on KVM. This is from a >> Citrix salesperson: >> "Here is some feedback on the following benefits of using Citrix >> XenServer over KVM: >> 1. Recurring Volume Snapshots with delta - Citrix XenServer is the >> only hypervisor where recurring snapshots will be deltas (in other >> hypervisors every volume snapshot is full) - this provides significant >> space savings on secondary storage >> 2. VM snapshots (taking a snapshot of a VM volumes including >> memory state - not possible with KVM which supports only volume >> snapshots) >> 3. Live Storage Migration is only possible on Citrix XenServer >> (not supported on KVM) >> 4. Live CPU and Memory Scaling for running instances (not supported on >> KVM)" >> On the Redhat side they have made it very clear that while Xen is >> still available, KVM is the hypervisor technology they are pushing & >> supporting going forward. >> On the Apache/Citrix side, I get the feeling that from a QA >> perspective CloudStack (and CloudPlatform) is based and tested on >> XenServer and would be preferable in a stable & reliable Production >> environment. > > Hello, > > You are mostly correct, those points seem valid and right now Xenserver is > the better supported hypervisor, it is quite mature and with loads of nice > features. I'm seriously considering it myself. > > Having said that, many clouds deployed nowadays are on KVM; yes it is missing > some features but it has a huge user base, it's very stable and the > performance is great; for me the killer feature is that I got a "real" OS as > hypervisor, an OS that I have used extensively and am quite familiar with, > for which we have deployment and monitoring infra in place etc etc. > Additionally, if you want to use more exotic stuff, such as GlusterFS, Ceph > or whatever crazy thing (CLVM over multiple mpath devices?) can run in > RHEL/CentOS proper KVM is again the best choice. If you want VXLAN you are > again limited to KVM afaik. > > So it kind of depends on your needs, luckily there are good quality options > to satisfy most of them. What I personally find most relevant for choosing a hypervisor is guest OS support. Not all hypervisors are created equal when it comes to supporting a wide mix of operating systems. Given that XenServer and KVM are both open source, I would recommend running both. It gives you OS flexibility and spreads risks. If you can afford, add VMware also. Enterprises love VMware. Regards. -- @shankerbalan M: +91 98860 60539 | O: +91 (80) 67935867 [email protected] | www.shapeblue.com | Twitter:@shapeblue ShapeBlue Services India LLP, 22nd floor, Unit 2201A, World Trade Centre, Bangalore - 560 055 Need Enterprise Grade Support for Apache CloudStack? Our CloudStack Infrastructure Support<http://shapeblue.com/cloudstack-infrastructure-support/> offers the best 24/7 SLA for CloudStack Environments. Apache CloudStack Bootcamp training courses **NEW!** CloudStack 4.2.1 training<http://shapeblue.com/cloudstack-training/> 18th-19th February 2014, Brazil. Classroom<http://shapeblue.com/cloudstack-training/> 17th-23rd March 2014, Region A. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> 24th-28th March 2014, Region B. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> 16th-20th June 2014, Region A. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> 23rd-27th June 2014, Region B. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. Any views or opinions expressed are solely those of the author and do not necessarily represent those of Shape Blue Ltd or related companies. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error. Shape Blue Ltd is a company incorporated in England & Wales. ShapeBlue Services India LLP is a company incorporated in India and is operated under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda is a company incorporated in Brasil and is operated under license from Shape Blue Ltd. ShapeBlue is a registered trademark.
